feat: issues/331 2,3,4 test case

Author: lv-z-l

test/issue.test.ts

@@ -1,4 +1,4 @@
-import { expectType } from 'tsd'
+import { expectError, expectType } from 'tsd'
 
 // https://github.com/wechat-miniprogram/api-typings/issues/11
 expectType<string>(wx.env.USER_DATA_PATH)
@@ -443,3 +443,48 @@ import WX = WechatMiniprogram
   expectType<number>(offscreenCanvas.height)
   expectType<number>(offscreenCanvas.width)
 }
+
+// https://github.com/wechat-miniprogram/api-typings/issues/332
+{
+  Component({
+    data: {
+      a: ''
+    },
+    methods: {
+      test() {
+        expectError<any>(this.data.xxx)
+      },
+    }
+  })
+}
+
+{
+  interface Foo {
+    f: string
+  }
+
+  Component({
+    _timer: '',
+    properties: {
+      bar: {
+        type: Object,
+        value: { f: '' } as Foo,
+        observer () {}
+      },
+      foo: {
+        type: Array,
+        value: [] as Foo[],
+      }
+    },
+    methods: {
+      getData() {
+        return this.data.foo
+      },
+      test() {
+        expectType<Foo>(this.data.bar)
+        expectType<Foo[]>(this.getData())
+        expectType<string>(this._timer)
+      },
+    }
+  })
+}

types/wx/lib.wx.component.d.ts

@@ -70,7 +70,7 @@ declare namespace WechatMiniprogram.Component {
         <
             TData extends DataOption,
             // 给泛型默认值，避免出现当组件无 properties 选项时
-            // 当xxx未在 data 中声明，this.data.xxx 为 any 的问题。
+            // 当xxx未在 data 中声明，this.data.xxx 为 any 且不报 TS2339 error 的问题。
             TProperty extends PropertyOption = {},
             TMethod extends MethodOption = {},
             TCustomInstanceProperty extends IAnyObject = {},